Use just single secret seal in payments

[dr-orlovsky]

Uses API fix introduced by RGB-WG/rgb-std#265

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 3.1%. Comparing base (5dd850d) to head (22a4583).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/pay.rs	0.0%	2 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##           master   #240   +/-   ##
=====================================
  Coverage     3.1%   3.1%           
=====================================
  Files          14     14           
  Lines        1728   1728           
=====================================
  Hits           53     53           
  Misses       1675   1675           

Flag	Coverage Δ
rust	3.1% <0.0%> (ø)

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[zoedberg]

ACK 22a4583